[2][3][4] Ben Crom is a mass gravity dam, meaning it is made of concrete and designed so that the dam's own weight stabilises it against the force of the water.

The middle of the structure consists of mass concrete with granite plumbs weighing up to 5 tonnes.

The outer face of the dam was made with precast concrete blocks.

The project cost approximately £1 million to build and employed 186 people.

[1][5] In 2012 Northern Ireland Water carried out refurbishments at Ben Crom as part of a £1.6 million scheme to maintain and improve a number of reservoirs in Northern Ireland.